netdev - Re: [PATCH v1 2/3] net/fsl: acpize xgmac

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Date:   Wed, 17 Jun 2020 18:49:31 +0100
From:   Russell King - ARM Linux admin <linux@...linux.org.uk>
To:     Calvin Johnson <calvin.johnson@....nxp.com>
Cc:     Jeremy Linton <jeremy.linton@....com>, Jon <jon@...id-run.com>,
        Cristi Sovaiala <cristian.sovaiala@....com>,
        Ioana Ciornei <ioana.ciornei@....com>,
        Andrew Lunn <andrew@...n.ch>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Madalin Bucur <madalin.bucur@....nxp.com>,
        netdev@...r.kernel.org, linux.cj@...il.com
Subject: Re: [PATCH v1 2/3] net/fsl: acpize xgmac_mdio

On Wed, Jun 17, 2020 at 10:45:34PM +0530, Calvin Johnson wrote:
> From: Jeremy Linton <jeremy.linton@....com>
> 
> Add ACPI support for xgmac MDIO bus registration while maintaining
> the existing DT support.
> 
> The function mdiobus_register() inside of_mdiobus_register(), brings
> up all the PHYs on the mdio bus and attach them to the bus.
> 
> Signed-off-by: Jeremy Linton <jeremy.linton@....com>
> Signed-off-by: Calvin Johnson <calvin.johnson@....nxp.com>
> ---
> 
>  drivers/net/ethernet/freescale/xgmac_mdio.c | 27 +++++++++++++--------
>  1 file changed, 17 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/net/ethernet/freescale/xgmac_mdio.c b/drivers/net/ethernet/freescale/xgmac_mdio.c
> index c82c85ef5fb3..fb7f8caff643 100644
> --- a/drivers/net/ethernet/freescale/xgmac_mdio.c
> +++ b/drivers/net/ethernet/freescale/xgmac_mdio.c
> @@ -245,14 +245,14 @@ static int xgmac_mdio_probe(struct platform_device *pdev)
>  {
>  	struct device_node *np = pdev->dev.of_node;
>  	struct mii_bus *bus;
> -	struct resource res;
> +	struct resource *res;
>  	struct mdio_fsl_priv *priv;
>  	int ret;
>  
> -	ret = of_address_to_resource(np, 0, &res);
> -	if (ret) {
> +	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> +	if (!res) {
>  		dev_err(&pdev->dev, "could not obtain address\n");
> -		return ret;
> +		return -EINVAL;
>  	}

I think, as you're completely rewriting the resource handling, it would
be a good idea to switch over to using devm_* stuff here.

	void __iomem *regs;

	regs = devm_platform_ioremap_resource(pdev, 0);
	if (IS_ERR(regs)) {
		dev_err(&pdev->dev, "could not map resource: %pe\n",
			regs);
		return PTR_ERR(regs);
	}

This also gets rid of the error checking on priv->mdio_base below, and
of course the unmap/resource handling for priv->mdio_base in the error
paths and device removal paths.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
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